Re: [TCML] Variac ID

[bturner@xxxxxxxx]

Measure the core size - determines the KVa rating. You should be able to
look up the specs on the 'web - Powerstats are still being manufactured.
You could even look it up based on the mounting hole dimensions.

The number of windings will also give it away - 120v will have less turns
with heavier wire. What is the diameter of the core (outside diameter)?
7-8" indicates about 2KVa, 14" or so indicates 5Kva. From what I remember,
1 turn per volt is about right.

14g wire indicates about 15 amps or so.


- b



> Is there any way I can determine whether my variac can be used for
> controlling 240 volts as opposed to 120?
> The only markings visible on it are the name of the manufacturer; SUPERIOR
> ELECTRIC CO./POWERSTAT.
> Perhaps measuring the excitation current?  Characteristics:  Wt 22 lbs,
> Wire size #14.
> I didn't measure the excitation current at 120 volts, since I have nothing
> to compare it with.
> Any help will be appreciated.  Thanks
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